MELONFARM 4" Air Filtration Kit — 190 CFM Inline Duct Fan, 12" High-Carbon Filter & Speed Controller

MELONFARM's 4-inch air filtration kit pairs a 190 CFM inline duct fan with a 12-inch activated carbon filter, speed controller, and ducting to control odors and move air in small grow tents and hydroponic spaces.

This compact kit brings ventilation and filtration together into a single package for indoor growers and hobbyists who need reliable airflow and effective odor reduction. The system includes a high-performance inline fan, a thick RC 412 virgin charcoal filter, an 8-foot flexible duct, a rubber coupler, and a variable-speed controller so you can tune airflow to your environment. Built components and a hexagonal steel mesh design focus on durability while maximizing open area for efficient filtration without choking the fan.

How does this kit remove odors in a grow tent?

The kit's filter contains high-grade RC 412 virgin activated charcoal with a high IAV rating for stronger adsorption of volatile compounds. The large carbon bed and dense packing increase contact time between air and carbon, improving odor capture for exhaust or intake applications.

• 12-inch carbon cylinder filled with premium Australian charcoal
• High IAV rating for increased absorption of VOCs and smells
• Removable pre-filter cloth catches dust and particulates before carbon
• Sealed flange design reduces carbon leakage and bypass

Will the fan move enough air for my small grow space?

The included 4" inline axial-style fan produces up to 190 CFM at 2,300 RPM, suitable for most compact tents, cabinets, and utility rooms. Use the speed controller to dial back noise or increase ventilation when lights are on and temperatures rise.

• 190 CFM peak airflow to exchange air rapidly in small enclosures
• Variable speed controller for quiet operation and humidity control
• Deflector design reduces turbulent flow for steadier performance
• Compatible with 4-inch ducting and standard fittings

How durable and easy to install is the system?

Components are made for repeated setup and long-term use: a heavy-duty flange and reinforced base keep the carbon bed secure, while double-sided galvanized hex mesh increases strength without blocking air. The kit fits common 4" duct sizes and includes a rubber coupler for airtight joins.

• Sturdy flange and base to prevent carbon migration and wear
• Hexagonal galvanized steel mesh for structural support and airflow
• 8-foot flexible ducting and rubber coupler for simple connections
• Removable pre-filter for easy maintenance and extended filter life

What maintenance does the filter and fan require?

Keep the pre-filter clean and replace the carbon when odor control drops. Periodically check the fan for dust buildup, and run the speed controller at lower settings to reduce wear when full flow isn't necessary.

• Wash or replace the pre-filter cloth every few weeks depending on dust
• Replace activated carbon when odors become noticeable
• Vacuum fan housing occasionally to remove dust and prolong motor life
• Inspect couplings and seals to maintain airtight performance

Who is this for: MELONFARM's 4" 190 CFM Air Filtration Kit is designed for hobby and small-scale indoor gardeners, hydroponic setups, and anyone needing compact, effective ventilation with odor control. It's well-suited to growers in apartments, RVs, closets, or small grow tents who want adjustable airflow, straightforward installation, and a durable carbon filter solution without upgrading to larger commercial systems.